A recent public health investigation in Las Vegas highlights a recurring and important truth about Legionnaires’ disease: risk arises not from water entering a property—but from what happens inside complex building water systems. The Wynn Las Vegas Investigation According to the Southern Nevada Health District, two travel-associated cases of Legionnaires’ disease have been linked to stays at the Wynn Las Vegas. One individual stayed at the resort in September 2025, and another in February 2026. Both individuals have since recovered. Following identification of these cases, health officials conducted environmental testing at the property. Multiple samples tested positive for Legionella, the…